Area 20/San Juan marine juvenile summary (DRAFT)
South Coast StA
Last update: 2024-06-18 15:37
0.1 Early marine entry (summer purse seine)
Download raw purse seine data with genetic results from here: https://github.com/khdavidson/A20/blob/main/outputs/R_OUT%20-%20PFN_DFO_FTFjuvi_2023_verified%20WITH%20RESULTS.xlsx
0.1.1 Catch overview
The following purse seine events occurred in 2023:
| date_start |
|---|
| 2023-06-28 |
| 2023-07-07 |
| 2023-07-20 |
| 2023-08-09 |
| 2023-08-23 |
Most Chinook were encountered in late June, with a later bump in catch in mid-August. Forage fish (herring, smelts) were the most common species, followed by Chinook and then Sandlance (one large catch on July 7). Purse seining likely started too late to encounter other salmon species (Coho, Chum) (see 1).
Figure 1: 2023 purse seine catch composition off Port Renfrew (Port San Juan). Numbers above bars represent total daily catch across all sets.
0.1.2 Chinook catch and biosamples (in progress)
Very few adipose-clipped hatchery Chinook were encountered, but clipped fish were generally larger than unclipped fish. However, note that on July 7, all fish with DNA results returned were hatchery-origin San Juan (1 clipped, 20 unclipped), with the exception of 1 unclipped Washington-origin hatchery fish (Willapa River).
Figure 2: 2023 purse seine catch composition in Port Renfrew of chinook only.
Figure 3: Size of Chinook (marked and unmarked) in 2023 purse seine samples in Port Renfrew.
Figure 4: GSI stock comps only from the samples collected July 7. Reminaing samples still in process.